Insulation of 92 sqm gable wall with 14 cm mineral wool commissioned. Cost 140€/sqm for preparatory work, insulation, plastering, painting, and scaffolding for 4 weeks, roofing work to extend the roof overhang 5,000,-€. The offers ranged between 230€ and 135€, roofer between 4,000€ and 9,500€. In my opinion, there were 3 defensive offers, also said a friend, retired cleaner. Btw: Approval from [BAFA] is still missing…